LAS VEGAS — Boxer Floyd Mayweather will have to serve the remainder of his jail sentence behind bars. Judge Melissa Saragosa denied Mayweather’s request. The boxer has recently said that he was unable to train, and because of that may be forced to retire. Mayweather was sentenced to 90 days in his domestic violence case . He was accused of hitting his ex-girlfriend, stealing her cell phone and threatening two of their children at her home.